EXCITED-STATES BUILT ON THE 6- ISOMER IN RB-86(37)49

High-spin state's of the doubly-odd nucleus Rb-86 containing 37 proton s and 49 neutrons have been investigated via the reaction (Se(Li, 3n)) -Se-82-Li-7 using Li-7 ions with energies between 30 and 35 MeV. The n ew level scheme is based on prompt gammagamma coincidences, angular di stributions and directional correlation orientation ratios of gamma ra ys as well as on linear polarizations of some strong gamma rays and co ntains levels with excitation energies up to 7.9 MeV and tentative spi ns up to 16h. For fifteen of the levels lifetimes in the ps region hav e been determined by analyzing the Doppler shift of gamma rays. Severa l fast Ml transitions with B(Ml) greater than or similar to 0.3 W.u. h ave been identified. The new high-spin level scheme of Rb-86 is interp reted on the basis of shell-model calculations in the configuration sp ace 1p3/2, 0f5/2, 1p1/2, and 0g9/2 for the protons and 1p1/2, 0g9/2, a nd 1d5/2 for the neutrons. The energies of the observed levels with I > 5 as well as most of the observed electromagnetic transition probabi lities could be well described. The excitation of a 099/2 neutron over the N=50 shell gap into the 1d5/2 orbital is predicted to cause remar kable alterations only for states with I(pi) greater-than-or-equal-to 15+. Some of the reduced M1 transition probabilities calculated within the shell model are found to depend critically on the parametrization used to describe the residual interaction.